Abstract
In this paper, following the idea of dual phase alloys, the authors dealt with the TiAl based Ti-Al-Si ternary alloys. The investigation was carried out to understand the basic properties of these alloys. Emphasis was placed on the relationship between microstructures and mechanical properties. Their present study has shown that a sufficient Si addition to the TiAl matrix resulted in TiAl + Ti{sub 5}Si{sub 3} dual phase alloys. The microstructure was coupled-growth in general which could be characterized as eutectic, hypoeutectic and hypereutectic. The second phase Ti{sub 5}Si{sub 3} contributed to the enforcement of the matrix, which was the expected result. However, high Si and Al contents resulted in low ductility and fracture strength. This was because of the coarse Ti{sub 5}Si{sub 3} primary phases and the embrittlement of the matrix. So in the view of alloy design, emphasis should be placed on the hypoeutectic and eutectic alloys, and adjusting the amount and shape of Ti{sub 5}Si{sub 3} in the Ti rich TiAl matrix may shed some light on their practical use in the future.
Published Version
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